Allow tasks to be suspended immediately after creation - provided the scheduler is not running.

Add API function that allows the tick count to be queried from an interrupt.

Source/include/task.h

@@ -963,7 +963,7 @@ signed portBASE_TYPE xTaskIsTaskSuspended( xTaskHandle xTask ) PRIVILEGED_FUNCTI
 
 /**
  * task. h
- * <PRE>volatile portTickType xTaskGetTickCount( void );</PRE>
+ * <PRE>portTickType xTaskGetTickCount( void );</PRE>
  *
  * @return The count of ticks since vTaskStartScheduler was called.
  *
@@ -972,6 +972,22 @@ signed portBASE_TYPE xTaskIsTaskSuspended( xTaskHandle xTask ) PRIVILEGED_FUNCTI
  */
 portTickType xTaskGetTickCount( void ) PRIVILEGED_FUNCTION;
 
+/**
+ * task. h
+ * <PRE>portTickType xTaskGetTickCountFromISR( void );</PRE>
+ *
+ * @return The count of ticks since vTaskStartScheduler was called.
+ *
+ * This is a version of xTaskGetTickCount() that is safe to be called from an
+ * ISR - provided that portTickType is the natural word size of the
+ * microcontroller being used or interrupt nesting is either not supported or
+ * not being used.
+ *
+ * \page xTaskGetTickCount xTaskGetTickCount
+ * \ingroup TaskUtils
+ */
+portTickType xTaskGetTickCountFromISR( void ) PRIVILEGED_FUNCTION;
+
 /**
  * task. h
  * <PRE>unsigned short uxTaskGetNumberOfTasks( void );</PRE>

Source/tasks.c

@@ -894,7 +894,7 @@ tskTCB * pxNewTCB;
 		portEXIT_CRITICAL();
 
 		/* We may have just suspended the current task. */
-		if( ( void * ) pxTaskToSuspend == NULL )
+		if( ( ( void * ) pxTaskToSuspend == NULL ) && ( xSchedulerRunning != pdFALSE ) )
 		{
 			portYIELD_WITHIN_API();
 		}
@@ -1175,6 +1175,12 @@ portTickType xTicks;
 }
 /*-----------------------------------------------------------*/
 
+portTickType xTaskGetTickCountFromISR( void )
+{
+	return xTickCount;
+}
+/*-----------------------------------------------------------*/
+
 unsigned portBASE_TYPE uxTaskGetNumberOfTasks( void )
 {
 	/* A critical section is not required because the variables are of type